At ~ 6:43 AM, Westmorland 911 dispatched Station 20 for a Residential Carbon Monoxide (CO) Alarm at a home on Waters Edge Court. Station 20 responded with Engine 20 (2 firefighters) with Chief 20 and Lieutenant 20 responding directly to the scene. Westmorland 911 also dispatched Station 610 (Murrysville Medic One) to support Station 20. Chief 20 was first on scene, established command, ensured that the home's occupants were out of the home, and assessed by Station 610 EMS personnel. Upon arrival of Engine 20, the crew surveyed the interior of the home with 4-Gas Meters, and found no evidence of carbon monoxide. Command 20 released all emergency units, and Rescue 20 returned to service and station.